KVM: PPC: Book3S HV: Add fast real-mode H_RANDOM implementation.

[firefly-linux-kernel-4.4.55.git] / arch / powerpc / kvm / book3s_hv_builtin.c

diff --git a/arch/powerpc/kvm/book3s_hv_builtin.c b/arch/powerpc/kvm/book3s_hv_builtin.c
index 1f083ff8a61a065cd7aa2dc2901000224e515e2e..1954a1c4b1f913c5d542bf571c2a503fb6d4c144 100644 (file)
--- a/arch/powerpc/kvm/book3s_hv_builtin.c
+++ b/arch/powerpc/kvm/book3s_hv_builtin.c
@@ -21,6 +21,7 @@
 #include <asm/cputable.h>
 #include <asm/kvm_ppc.h>
 #include <asm/kvm_book3s.h>
+#include <asm/archrandom.h>
 
 #define KVM_CMA_CHUNK_ORDER    18
 
@@ -169,3 +170,17 @@ int kvmppc_hcall_impl_hv_realmode(unsigned long cmd)
        return 0;
 }
 EXPORT_SYMBOL_GPL(kvmppc_hcall_impl_hv_realmode);
+
+int kvmppc_hwrng_present(void)
+{
+       return powernv_hwrng_present();
+}
+EXPORT_SYMBOL_GPL(kvmppc_hwrng_present);
+
+long kvmppc_h_random(struct kvm_vcpu *vcpu)
+{
+       if (powernv_get_random_real_mode(&vcpu->arch.gpr[4]))
+               return H_SUCCESS;
+
+       return H_HARDWARE;
+}